/*
* Copyright 2010-2015 Institut Pasteur.
*
* This file is part of Icy.
*
* Icy is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Icy is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Icy. If not, see <http://www.gnu.org/licenses/>.
*/
package icy.common.listener.weak;
import java.lang.ref.WeakReference;
/**
* Base weak listener class.
*
* @author Stephane
*/
public abstract class WeakListener<T>
{
private final WeakReference<T> listenerRef;
public WeakListener(T listener)
{
super();
listenerRef = new WeakReference<T>(listener);
}
public T getListener(Object source)
{
final T listener = listenerRef.get();
// no more listener --> remove weak object from list
if (listener == null)
removeListener(source);
return listener;
}
public T getListener()
{
return getListener(null);
}
public abstract void removeListener(Object source);
}